Libvirt provides a portable, long term stable C API for managing the virtualization technologies provided by many operating systems. It includes support for QEMU, KVM, Xen, LXC, bhyve, Virtuozzo, VMware vCenter and ESX, VMware Desktop, Hyper-V, VirtualBox and the POWER Hypervisor.
Go to file
Michal Privoznik 499e302f96 virtlockd: Don't SIGSEGV on SIGUSR1
So we have this mechanism that on SIGUSR1 the virtlockd dumps its
internal state into a JSON file, reexec itself and the reloads
the internal state back. However, there's a bug in our
implementation:

  (gdb) signal SIGUSR1
  Continuing with signal SIGUSR1.
  [Thread 0x7fd094f7b700 (LWP 10602) exited]
  process 10600 is executing new program: /home/zippy/work/libvirt/libvirt.git/src/virtlockd
  warning: Could not load shared library symbols for linux-vdso.so.1.
  Do you need "set solib-search-path" or "set sysroot"?
  [Thread debugging using libthread_db enabled]
  Using host libthread_db library "/lib64/libthread_db.so.1".
  [New Thread 0x7fb28bc3c700 (LWP 14501)]

  Program received signal SIGSEGV, Segmentation fault.
  0x00007fb29133d530 in virExpandN (ptrptr=0x70, size=8, countptr=0x68, add=1, report=true, domcode=7, filename=0x7fb29138aeab "rpc/virnetserver.c", funcname=0x7fb29138b680 <__FUNCTION__.15821> "virNetServerAddProgram", linenr=661) at util/viralloc.c:288
  288         if (*countptr + add < *countptr) {
  (gdb) bt
  #0  0x00007fb29133d530 in virExpandN (ptrptr=0x70, size=8, countptr=0x68, add=1, report=true, domcode=7, filename=0x7fb29138aeab "rpc/virnetserver.c", funcname=0x7fb29138b680 <__FUNCTION__.15821> "virNetServerAddProgram", linenr=661) at util/viralloc.c:288
  #1  0x00007fb29132a267 in virNetServerAddProgram (srv=0x0, prog=0x7fb2915d08b0) at rpc/virnetserver.c:661
  #2  0x00007fb29131f27f in main (argc=1, argv=0x7fff8f771298) at locking/lock_daemon.c:1445

Notice the NULL @srv passed to frame 2? Usually, the @srv
variable is initialized on fresh start. However, in case of
daemon reload, the code path that is responsible for initializing
the value was not triggered and therefore we crashed immediately.
Fix this by always setting the variable.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
2015-10-16 16:51:41 +02:00
.gnulib@f39477dba7 maint: update to latest gnulib 2015-06-01 13:23:18 -06:00
build-aux bracket-spacing: Add syntax-check for unnecessary curly brackets 2014-11-14 17:13:36 +01:00
daemon Start daemon only after filesystems are mounted 2015-08-26 16:27:49 +02:00
docs NEWS: Unify date format 2015-10-14 18:18:03 +02:00
examples Add example that renames domain there and back 2015-09-04 18:55:01 +02:00
gnulib maint: fix date in local gnulib patch 2015-01-05 16:44:10 +00:00
include Introduce new VIR_DOMAIN_EVENT_DEFINED_RENAMED event 2015-08-14 10:50:20 +02:00
m4 virt-driver-vz: Require parallels-7.0.22 at least 2015-07-13 19:46:10 +03:00
po vz: remove storage driver as never used 2015-10-06 18:22:47 +03:00
src virtlockd: Don't SIGSEGV on SIGUSR1 2015-10-16 16:51:41 +02:00
tests qemu: Fix qemu startup check for QEMU_CAPS_OBJECT_IOTHREAD 2015-10-16 06:55:45 -04:00
tools virsh: Use 'format' argument only when specified 2015-10-16 09:01:17 +02:00
.ctags maint: Make ctags work out of the box 2013-07-18 08:47:21 +02:00
.dir-locals.el build: avoid tabs that failed syntax-check 2012-09-06 09:43:46 -06:00
.gitignore .gitignore: Ignore the correct rename example binary 2015-09-07 10:40:55 +02:00
.gitmodules
.mailmap maint: update .mailmap for recent contributions 2015-03-20 06:17:55 -06:00
AUTHORS.in AUTHORS: Add myself to the list of committers 2015-10-08 11:48:26 +02:00
autobuild.sh Disable libvirtd by default when building on Win32 2014-04-29 11:30:32 +01:00
autogen.sh maint: improve usage of autogen's --no-git 2015-02-06 11:35:29 -07:00
bootstrap maint: update to latest gnulib 2015-03-26 09:41:55 -06:00
bootstrap.conf bootstrap: Don't require python-config 2015-08-06 14:35:14 +02:00
cfg.mk tools: Introduce new client generic module vsh 2015-08-14 15:45:44 +02:00
ChangeLog-old Fix typos in src/* 2014-04-21 16:49:08 -06:00
config-post.h build: fix build of virt-login-shell on systems with older gnutls 2013-10-22 09:41:50 -06:00
configure.ac Post-release version bump to 1.2.21 2015-10-02 16:14:26 +02:00
COPYING maint: follow recommended practice for using LGPL 2013-05-20 14:15:21 -06:00
COPYING.LESSER maint: Remove control characters from LGPL license file 2015-09-25 09:16:24 +02:00
HACKING maint: document use of zanata for translations 2015-06-10 15:26:44 -06:00
libvirt-admin.pc.in Add libvirt-admin library 2015-06-16 13:46:20 +02:00
libvirt-lxc.pc.in Add pkg-config files for libvirt-qemu & libvirt-lxc 2014-06-23 16:17:27 +01:00
libvirt-qemu.pc.in Add pkg-config files for libvirt-qemu & libvirt-lxc 2014-06-23 16:17:27 +01:00
libvirt.pc.in Add pkg-config files for libvirt-qemu & libvirt-lxc 2014-06-23 16:17:27 +01:00
libvirt.spec.in spec: Delete .git after applying patches 2015-10-06 15:54:47 -04:00
Makefile.am examples: Add missing build data for 'rename' 2015-09-07 09:00:19 +02:00
Makefile.nonreentrant maint: use LGPL correctly 2013-05-20 14:03:48 -06:00
mingw-libvirt.spec.in parallels: substitute parallels with vz spec file and Makefile 2015-06-17 15:07:55 +03:00
README
README-hacking docs: update README-hacking 2014-05-06 16:20:24 -06:00
run.in Add PKG_CONFIG_PATH to run.in script. 2014-06-26 14:32:35 +01:00
TODO

         LibVirt : simple API for virtualization

  Libvirt is a C toolkit to interact with the virtualization capabilities
of recent versions of Linux (and other OSes). It is free software
available under the GNU Lesser General Public License. Virtualization of
the Linux Operating System means the ability to run multiple instances of
Operating Systems concurrently on a single hardware system where the basic
resources are driven by a Linux instance. The library aim at providing
long term stable C API initially for the Xen paravirtualization but
should be able to integrate other virtualization mechanisms if needed.

Daniel Veillard <veillard@redhat.com>